自动获取订单编号失败

application/api/controller/WorkOrder.php

@@ -2238,8 +2238,12 @@ class WorkOrder extends Api
             ->where('订单编号','like','%'.$time.'%')
             ->order('Uniqid desc')
             ->find();
-        $lastNumber = substr($lastOrder['订单编号'],6);
-        $newNumber = (int)$lastNumber + 1;
+        if (empty($lastOrder)){
+            $newNumber = 1;
+        }else{
+            $lastNumber = substr($lastOrder['订单编号'],6);
+            $newNumber = (int)$lastNumber + 1;
+        }
         if ($newNumber<10){
             $newOrder = 'DC'.$time.'00'.$newNumber;
         }elseif ($newNumber>=10 && $newNumber<100){
@@ -2345,9 +2349,4 @@ class WorkOrder extends Api
         }
     }
 
-    //图片上传
-    public function photoAdd()
-    {
-
-    }
 }